Windows Administration & Microsoft 365 Support for Texas Businesses
Windows and Microsoft 365, set up right and run.
Microsoft 365 is powerful, but it's only as reliable as the setup behind it. Defcor handles migration, configuration, security, and day-to-day administration — so your email, files, and Teams actually work the way your business needs.
Delivered remotely — migration, configuration and day-to-day administration, with no visit required.
Microsoft 365 has become the backbone of most Texas small businesses — email, files, calendars, Teams, and the document collaboration that runs the workday. But moving to the cloud didn't remove the need for someone to set it up properly, secure it, and keep it working. It just moved where that work happens.
Defcor manages Microsoft 365 the way we manage on-site IT: with ownership. We handle migrations from broken old setups, configure the right security baseline, manage user lifecycles, and answer when something stops working. You get the power of Microsoft 365 without being your own administrator.
What it is
The cloud still needs someone running it.
Microsoft 365 support is the setup, security, and administration of your Microsoft cloud tenant — the email, files, and collaboration tools your team uses daily. It covers the initial migration, the configuration that makes it safe and usable, and the ongoing administration of users, licenses, and policies.
Done badly, you get shared mailboxes no one can access, files scattered across personal OneDrives, accounts that stay active after an employee leaves, and a security posture that's one phished password from a breach. Done well — the way we do it — it's invisible, reliable, and secure.
How it works
From setup to a secure, working tenant.
- 01
Migrate cleanly
We move your email, files, and data from your old system to Microsoft 365 with minimal disruption — and verify nothing was lost in the move.
- 02
Secure the baseline
We configure multi-factor authentication, conditional access, and the policies that protect your accounts — closing the doors attackers walk through.
- 03
Administer ongoing
We manage users, licenses, and policies day to day — onboarding, offboarding, and the changes your business needs.
What you get
Microsoft 365, run properly.
Email migration
Move from on-premise Exchange, Gmail, or another provider to Microsoft 365 without losing mail, contacts, or calendar history.
Multi-factor authentication
MFA set up the right way — secure, conditional, and not so painful that your team turns it off.
User lifecycle management
Onboarding, role changes, and offboarding handled promptly — including the security-critical step of disabling departed accounts.
SharePoint & Teams
File storage and collaboration structured so people can find what they need and can't reach what they shouldn't.
License optimization
Right-sized licensing so you're not paying for seats you don't use or features you don't need.
Backup & recovery
Microsoft 365 has shared responsibility — we back up your cloud email and files so accidental deletion and corruption don't become losses.
Who it's for
Texas businesses running on Microsoft.
Professional services
Law, accounting, and consulting firms where email and document collaboration are the workday — and where a misconfigured mailbox is a client-facing problem.
Healthcare practices
Clinics coordinating across providers and front offices, where secure email and calendar access are daily essentials.
Growing teams
Businesses adding staff who need fast, consistent onboarding — and clean offboarding when someone leaves.
Businesses leaving broken email
Companies outgrowing on-premise Exchange, a cheap IMAP host, or a setup that was never finished — and ready to do it right.
The difference
Defcor-managed 365 vs. self-managed tenant.
| Compare | Defcor-managed 365 | Self-managed tenant |
|---|---|---|
| Migration | Verified, no data loss | DIY, risky |
| MFA & security | Configured properly | Often skipped or bypassed |
| Offboarding | Accounts disabled promptly | Forgotten active accounts |
| File structure | Organized, governed | Scattered across OneDrives |
| Licensing | Right-sized, cost-aware | Paying for unused seats |
| When it breaks | We fix it | You're on hold with Microsoft |
Case in point
A San Antonio firm's messy migration.
A 22-person San Antonio engineering firm had outgrown its on-premise email server and tried a self-service migration to Microsoft 365. The result was duplicated mailboxes, half the team missing calendar history, and two departed contractors whose accounts were still active months later.
Defcor cleaned it up: consolidated the mailboxes, recovered the calendar data, secured the tenant with conditional access, and disabled the lingering accounts. We set up a proper SharePoint structure and took over day-to-day administration. The firm's monthly license bill actually dropped — and their email finally worked.
Questions
The things owners actually ask.
Yes. We migrate from on-premise Exchange, Gmail, and other providers to Microsoft 365 with verified mail, contact, and calendar history — and minimal disruption to your team.
Yes, and we set it up properly. MFA is the single biggest reduction in account-takeover risk, and we configure it so it's secure without making your team hate it.
We disable the account promptly, secure the mailbox and files, and manage license recovery — closing one of the most common security gaps in small-business tenants.
Often, yes. We audit your licensing, reclaim unused seats, and right-size plans. The savings regularly cover the cost of having us manage it.
Yes — we structure file storage and collaboration so your team can find and share work without the chaos of unmanaged personal OneDrives.
Microsoft 365 follows shared responsibility — they protect the service, but accidental deletion is on you. We add backup for email and files so your cloud data is recoverable.
We can manage licenses whether you buy them direct or through us. Our value is in the setup, security, and administration — not reselling seats.
Hear it for yourself — talk to the agent.
Call our live AI phone agent or have it call you back. It presents the business and answers your questions in real time.